The key component of any distributed or web application testing scheme, is Performance Testing. Performance Testing helps determine software load limitations early. Performance Testing ensures that the application delivered to a customer satisfies high load, availability and scalability requirements and helps to configure the system appropriately to avoid unexpected crashes. JMeter is a performance testing framework from Apache, has been widely accepted as a performance testing tool for Web applications.
It can be used to analyze overall server performance under simulated heavy load. The software features FTP and HTTP requests and extensible custom scripting features. JMeter is a tool that can be used to test applications utilizing HTTP or FTP servers. It is Java based and is highly extensible through a provided API. A typical JMeter test involves creating a loop and a thread group. The loop simulates sequential requests to the server with a preset delay. A thread group is designed to simulate a concurrent load. JMeter provides a user interface. It also exposes an API that allows you to run JMeter-based tests from a Java application.
To create a load test in JMeter build a test plan, which is essentially a sequence of operations JMeter will execute. The simplest test plan normally must include elements like thread group which are elements used to specify number of running threads and a ramp-up period, samplers which are elements that are configurable requests to the server HTTP, FTP, or LDAP requests. and listeners which are again elements used to post process request data.
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